NAME
audit —
Security Event Audit
SYNOPSIS
#include
<bsm/audit.h>
#include
<bsm/audit_internal.h>
#include
<bsm/audit_kevents.h>
DESCRIPTION
Security Event Audit is a facility to provide fine-grained,
configurable logging of security-relevant events, and is intended to meet
the requirements of the Common Criteria (CC) Common Access Protection
Profile (CAPP) evaluation. The FreeBSD and Mac OS X
audit facility implements the de facto industry
standard BSM API, file formats, and command line interface, first found in
the Solaris operating system. Information on the user space implementation
can be found in libbsm(3).
Audit support is enabled at boot, if present in the kernel, using
an rc.conf(5) flag or, on Mac OS X, by editing the
/System/Library/LaunchDaemons/com.apple.auditd.plist
launchd plist file and removing the disabled key or changing its value to
false. The audit daemon, auditd(8), is responsible for configuring the kernel to
perform audit, pushing configuration data from the
various audit configuration files into the kernel.
Audit Special Device
The FreeBSD kernel
audit facility provides a special device,
/dev/audit, which is used by
auditd(8)
to monitor for audit events, such as requests to
cycle the log, low disk space conditions, and requests to terminate
auditing. This device is not intended for use by applications. Mac OS X
provides this same functionality using Mach IPC and a host special port.
Audit Pipe Special Devices
Audit pipe special devices, discussed in auditpipe(4), provide a configurable live tracking mechanism to allow applications to tee the audit trail, as well as to configure custom preselection parameters to track users and events in a fine-grained manner.
SEE ALSO
auditreduce(1), praudit(1), audit(2), auditctl(2), auditon(2), getaudit(2), getauid(2), poll(2), select(2), setaudit(2), setauid(2), libbsm(3), auditpipe(4), audit_class(5), audit_control(5), audit_event(5), audit.log(5), audit_user(5), audit_warn(5), launchd.plist(5), rc.conf(5), audit(8), auditd(8)
HISTORY
The OpenBSM implementation was created by McAfee Research, the security division of McAfee Inc., under contract to Apple Computer Inc. in 2004. It was subsequently adopted by the TrustedBSD Project as the foundation for the OpenBSM distribution.
Support for kernel audit first appeared in
Mac OS X 10.3 and FreeBSD 6.2.
AUTHORS
This software was created by McAfee Research, the security research division of McAfee, Inc., under contract to Apple Computer Inc. Additional authors include Wayne Salamon, Stacey Son, Robert Watson, and SPARTA Inc.
The Basic Security Module (BSM) interface to audit records and audit event stream format were defined by Sun Microsystems.
This manual page was written by Robert Watson ⟨rwatson@FreeBSD.org⟩.
BUGS
The audit facility in
FreeBSD is considered experimental, and production
deployment should occur only after careful consideration of the risks of
deploying experimental software.
The Mac OS X and FreeBSD kernel do not fully validate that audit records submitted by user applications are syntactically valid BSM; as submission of records is limited to privileged processes, this is not a critical bug.
Instrumentation of auditable events in the kernel is not complete, as some system calls do not generate audit records, or generate audit records with incomplete argument information.
Mandatory Access Control (MAC) labels, as provided by the mac(4) facility, are not audited as part of records involving MAC decisions.